Its been argued here that Amendment X of the US consitution is the legal mechanism for secession. Do you disagree?
Here's one for you: "precedent".
Pronunciation: 'pre-s&-d&nt
Function: noun
Date: 15th century
1 : an earlier occurrence of something similar
2 : something done or said that may serve as an example or rule to authorize or justify a subsequent act of the same or an analogous kind.
For example, you established a precedent by not responding to a twice asked question of mine, indicating that it is acceptable to you for me to not respond to your twice asked question. BTW, My twice asked question to you was specifically in regards to something you stated.